Verification of Millman's Theorem 
References
Books
1) A. Chakrabarti, Circuit Theory (Analysis and Synthesis). Fifth Edition : 2006, Dhanpat Rai and Co.
2) A. Bruce Carlson, Circuits. First Reprint :2002, Thomson Asia Pte Ltd.
3) Parker Smith, Problems in Electrical Engineering. Ninth Edition :2003 , M/s Constable and Company, London.